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- static char copyr[] = "Copyright 1990 by Dr. R. Brooks Van Horn, Jr.";
-
- /*
- This version of the Print Screen routine is for the Epson LQ 2500
- series printer and a VGA or EGA video adaptor with the higher
- resolution video modes, including super VGA. These C-routines
- were written using Mix's Power C.
- */
-
- #include <malloc.h>
- #include <bios.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <conio.h>
- #include <dos.h>
-
- #define DITHER 7 /* dimension of dithering matrix */
- #define dpi 180 /* printer resolution in dots per inch */
- #define pmode 39 /* 24 pin mode for the dpi resolution */
- #define esc 27
-
- /* functions needed in program */
- void interrupt (far * int05)(void);
- void interrupt PrtScrn (void);
- int Print ( int, char * );
- int Graphics ( char, char, char );
- void PinSet ( char *, char *, char *, int, int );
- char Read_Pixel (int, int);
-
- /* static global data needed */
- static int Max_Rows;
- static int Max_Cols;
- static int number;
- static int phase;
- static char Video_Mode;
- static long Columns;
- int h_ratio, h_fract, v_ratio, v_fract;
- char far * dds = 0x00000000; /* DOS Data Segment */
- int far * dkb = 0x0000041a; /* DOS Keyboard Area */
- char far * vds = 0x00000500; /* Video Data Segment */
- char far * Regen = 0xa0000000; /* Video Screen Address */
-
- struct PINS {
- int first [12];
- int last [12];
- char value [12];
- } head;
-
-
- /*----------------------------------------------------------------------*/
-
- main ()
- {
- unsigned int pgm_size;
- char far * ptr = 0x00000467; /* use cassette data area */
-
- number = 0;
- *vds = 0;
- if (*ptr == 'b' && *(ptr+1) == 'v' && *(ptr+2) == 'h') {
- puts ("Epson24.Exe TSR is already resident.");
- exit (1);
- }
-
- int05 = getvect (0x05);
- *(ptr ) = 'b';
- *(ptr+1) = 'v';
- *(ptr+2) = 'h';
- setvect (0x05, PrtScrn);
- pgm_size = farsetsize(0);
- puts ("Epson LQ-2500 Graphics Print Screen TSR");
- puts ( copyr );
- puts ("has now been installed.");
- keep (0, pgm_size);
- }
-
- /*----------------------------------------------------------------------*/
-
- void interrupt PrtScrn (void)
- {
- int row, col, index, height, cbit, error, tsum, kb_head, kb_tail;
- int col_to_do, total, pin, i, j, k, rtot, extra, tcheck, kntr;
- char pat, pat1, pat2, pat3, zero = 0x00;
- char init_prn[] = { esc, '@' }; /* inititialize printer */
- char graph[] = { esc, '*', pmode, 0, 0 }; /* 24 pin graphics 180 dpi */
- char set_lf_180[] = { esc, '3', 24 }; /* set line feed to 24/180" */
- char crlf[] = { 0x0d, 0x0a }; /* do cr/lf cmd */
- char eop[] = { 0x0c, esc, '@' }; /* reset & eject page */
- char ahp[] = { esc, '$', 60, 0 }; /* move 1" from left margin */
- union REGS regs;
-
- /* if user pushed called us twice with no result then do it now */
- if (++number > 1)
- *vds = 0;
- if (*vds != 0) { /* if printing is active then exit */
- sound (1500,5);
- sound (1000,5);
- sound (1500,5);
- return;
- }
- number = 0;
- Video_Mode = *(dds + 0x0449);
- if ((Video_Mode < 4) || (Video_Mode == 7)) {/* if not a graphics mode */
- int05();
- *vds = 0;
- return;
- }
- /* we are now in a position to do a print screen */
- *vds = 0xff; /* mark print screen status flag for others */
- enable(); /* enable further interrupts */
- kb_head = *(dkb);
- kb_tail = *(dkb+1);
- Max_Rows = (int) *(dds + 0x0484) + 1;
- Max_Cols = ((int) *(dds + 0x044a)) + (((int) *(dds + 0x0000044b)) << 8);
- height = (int) *(dds + 0x0485);
- Max_Rows *= height; /* convert text chars to pixels */
- Columns = (long) Max_Cols;
- Max_Cols *= 8;
- /*
- The dimensions of the screen were obtained from the bios data area.
- The next step is to determine the size of the picture based on
- reserving a one inch margin on all sides and trying to use a 5 x 5
- dithering matrix. We use the term vertical to represent the
- direction along the 8.5" side of the printer paper and horizontal
- along the 11" side.
-
- ┌──────────────────────────────┐
- │ 1" │
- │ ┌──────────────────────┐ │
- │ │ Top │ │
- │ │ │ │
- │ │ │ │
- <------- │ 1"│ Picture │1" │ 8.5"(v)
- Paper │ │ │ │
- Feed │ │Left │ │
- │ └──────────────────────┘ │
- │ 1" │
- └──────────────────────────────┘
- 11" (h)
- */
- v_ratio = (13 * dpi) >> 1; /* setup for 6.5" along vertical side */
- /* but adjust if it is too big for dithering matrix */
- v_ratio = v_ratio > (DITHER * Max_Rows) ? (DITHER * Max_Rows) : v_ratio;
- h_ratio = (4 * v_ratio + 1) / 3; /* 4:3 ratio adj for length */
- /* get the fraction part of the ratio for vertical and horizontal */
- v_fract = v_ratio % Max_Rows;
- v_fract = (10 * v_fract + (Max_Rows>>1)) / Max_Rows; /* in [0,9] */
- h_fract = h_ratio % Max_Cols;
- h_fract = (10 * h_fract + (Max_Cols>>1)) / Max_Cols; /* in [0,9] */
- /* then get the integer part of the ratios */
- v_ratio = v_ratio / Max_Rows;
- h_ratio = h_ratio / Max_Cols;
- /* now check for overflows in rounding too high */
- if (v_fract >= 10) {
- v_ratio++;
- v_fract -= 10;
- }
- if (h_fract >= 10) {
- h_ratio++;
- h_fract -= 10;
- }
- /* define the number of bytes to send printer per line of graphics */
- tcheck = ((10 * v_ratio + v_fract) * Max_Rows) / 10;
- graph[3] = tcheck & 0x00ff;
- graph[4] = tcheck >> 8;
- /* initialize the printer */
- regs.byte.ah = 1;
- regs.word.dx = 0;
- int86 ( 23, ®s, ®s ); /* initialize port LPT0 */
- if ( Print ( 2, init_prn ) ) /* reset the printer */
- goto GET_OUT;
- for (k = 0; k < 5; ++k) /* make a 1" top margin */
- if ( Print ( 2, crlf ) )
- goto GET_OUT;
- if ( Print ( 3, set_lf_180 ) )
- goto GET_OUT;
- /* for the 24 pin printer, get the number of column pixels/pass */
- col_to_do = 240 / (10 * h_ratio + h_fract);
- kntr = 0;
- for ( col = 0; col < Max_Cols; col += col_to_do ) {
- /* move print head 1" from the left margin */
- if ( Print ( 4, ahp ) ) /* advance to horizontal position */
- goto GET_OUT;
- /* check for key pressed */
- if ((*dkb != kb_head) || (*(dkb+1) != kb_tail)) {
- *dkb = kb_head; /* restore head of kbd */
- *(dkb+1) = kb_tail; /* restore tail of kbd */
- Print ( 3, eop );
- goto GET_OUT;
- }
- /* declare number of items to send to printer */
- tsum = 0;
- if ( Print ( 5, graph ) )
- goto GET_OUT;
- rtot = 0;
- extra = 0;
- for (row = Max_Rows-1; row >= 0; --row ) {
- total = 0;
- pin = 0;
- k = 0;
- /* for this row, get the next col_to_do column values */
- for ( cbit = 0; cbit < col_to_do ; ++cbit ) {
- /* read a pixel's color */
- pat = Read_Pixel ( row, (col+cbit) );
- /* replicate that color at h_ratio pins */
- pin += h_ratio;
- /* add fraction in to the sum */
- total += h_fract;
- if (total >= 10) { /* adjust for fractionals */
- total -= 10;
- ++pin;
- }
- head.first [cbit] = k; /* 1st pin location */
- head.last [cbit] = pin; /* last pin location */
- head.value[cbit] = pat; /* pen color */
- k = pin;
- }
- /*
- We now have the pins loaded, next determine the
- three dithered bytes to use for this print head.
- */
- rtot = v_ratio; /* vert no to duplicate */
- extra += v_fract; /* spill-over */
- if (extra >= 10) {
- ++rtot;
- extra -= 10;
- }
- /*
- combine the col_to_do pins into 3 bytes to be printed
- */
- for ( k = 0; k < rtot; k++) {
- if (++tsum <= tcheck) {
- PinSet ( &pat1, &pat2, &pat3, k, col_to_do );
- if ( Graphics ( pat1, pat2, pat3 ) )
- goto GET_OUT;
- }
- } /* end for k loop on PinSet */
- } /* end for-loop on rows */
- for ( ; tsum <= tcheck; ++tsum ) {
- Graphics ( zero, zero, zero );
- }
- /* do a cr/lf on the printer at the end of line of graphics */
- if ( Print (2, crlf) )
- goto GET_OUT;
- } /* end for-loop on cols */
- Print ( 3, eop ); /* reset the printer and do a form feed */
- GET_OUT:
- *vds = 0;
- return;
- }
-
- /*----------------------------------------------------------------------*/
-
- char Read_Pixel ( int row, int col )
- {
- long offset = (long)(col>>3) + (long) row * Columns;
- int plane;
- char color = 0x00, mask, temp;
- union REGS regs;
-
- if ((row > Max_Rows) || (col > Max_Cols))
- return 0;
- if (Video_Mode < 8) { /* for non-ega/vga modes do */
- /* a ROM BIOS call to get color */
- regs.word.ax = 0x0d00;
- regs.word.bx = 0;
- regs.word.cx = col;
- regs.word.dx = row;
- int86 ( 16, ®s, ®s );
- color = regs.byte.al;
- }
- else {
- /* use ega/vga registers to get the color */
- mask = 0x80 >> (col % 8); /* the bit mask for addressed byte */
- outp (0x3ce,4); /* select the Map Mask register */
- for (plane = 3; plane >= 0; --plane) {
- outp (0x3cf,plane); /* address the bit plane */
- temp = *(Regen + offset) & mask; /* mask off the color bit */
- temp = temp ? 1 : 0 ; /* set bit if color match */
- color = (color << 1) | temp; /* save plane results */
- }
- outp (0x3c4,2); /* restore adaptor to Write Mode 0 */
- outp (0x3c5,15); /* with all planes enabled */
- }
- return color;
- }
-
- /*----------------------------------------------------------------------*/
-
- void PinSet ( pat1, pat2, pat3, sect, maxc )
- char *pat1, *pat2, *pat3; /* the three bytes to be sent to the printer */
- int sect; /* which relative print head column we are on */
- int maxc; /* the number of entries in the head structure */
- {
- char pat;
- char pats[DITHER][DITHER]; /* the dithering matrix */
- char R, G, B, I;
- int bit, k, ndx, b1, b2, wd, i, j, top, kmod;
- union COVER { /* equivalence is needed for the 24 pins */
- long lword;
- char bytes[4];
- } cover;
-
-
- top = v_ratio;
- if (v_fract) ++top;
- top = top < DITHER ? top : DITHER;
- *pat1 = *pat2 = *pat3 = 0x00;
- for (ndx = 0; ndx < maxc; ++ndx) {
- /* retrieve the color for this pin section */
- pat = head.value[ndx];
- b1 = head.first[ndx];
- b2 = head.last [ndx];
- if (!pat) /* skip remainder if this is a zero byte */
- continue;
- /* get planes that are on in the pattern */
- switch (top) {
- case 1:
- case 2:
- R = pat;
- kmod = 1;
- break;
- case 3:
- R = (pat & 0x03); /* B or R */
- G = (pat & 0x0c); /* G or I */
- kmod = 2;
- break;
- case 4:
- B = pat & 0x09; /* B or I */
- R = pat & 0x0a; /* R or I */
- G = pat & 0x0c; /* G or I */
- I = pat & 0x08; /* I */
- kmod = 3;
- break;
- default:
- B = pat & 0x01;
- R = pat & 0x02;
- G = pat & 0x04;
- I = pat & 0x08;
- kmod = 4;
- }
- for (i = 0, k = 0; i < top; ++i) {
- for (j = 0; j < top; ++j, ++k) {
- switch ( k % kmod ) {
- case 0:
- pats[i][j] = R;
- break;
- case 1:
- pats[i][j] = G;
- break;
- case 2:
- pats[i][j] = B;
- break;
- case 3:
- pats[i][j] = I;
- } /* end switch block */
- } /* end for j loop */
- } /* end for i loop */
-
- /* now create bytes for printing with these patterns */
- cover.lword = 0L;
- for (bit = b1; bit < b2; ++bit) {
- k = bit - b1; /* col index to pats array */
- if (pats[k][sect]) { /* if we are to dither this */
- j = bit;
- wd = j / 8; /* word index */
- i = 7 - ( j % 8 ); /* bit index */
- cover.bytes[wd] |= (0x01 << i); /* and the bit mask */
- }
- }
- *pat1 |= cover.bytes[0];
- *pat2 |= cover.bytes[1];
- *pat3 |= cover.bytes[2];
- }
- return;
- }
-
- /*--------------------------------------------------------------*/
-
- int Graphics ( char byte1, char byte2, char byte3 )
- {
- char array[3];
-
- array[0] = byte1;
- array[1] = byte2;
- array[2] = byte3;
- return ( Print (3, array) );
- }
-
- /*--------------------------------------------------------------*/
-
- int Print ( int items, char * strng )
- {
- int i;
- int result;
- union REGS regs;
-
- for (i= 0; i < items; ++i) {
- regs.byte.ah = 0; /* function number */
- regs.byte.al = strng[i]; /* character to print */
- regs.word.dx = 0; /* printer Lpt0 */
- int86 ( 23, ®s, ®s );
- result = (int) regs.byte.ah; /* printer return code */
- if (result & 0x0029) {
- /* printer error */
- sound ( 750, 27 );
- return ( result );
- }
- }
- return 0;
- }
-